The smallest known star in the universe is OGLE-TR-122b. It has a diameter of 8.29 × 103 km. The largest known star in the universe, VY Canis Majoris, is about 1.67 × 105 times larger than OGLE-TR-122b. What is the diameter of VY Canis Majoris?

2.38 × 109 km

1.38 × 109 km

1.38 × 1011 km

7.3 × 107 km

Question 5:

There are 3.2×108 virus in a sample vile. How many total number of virus will there be in 5,000 such vile?

16×108

16.0×1012

1.6×1012

1.6×1011

Question 6:

= __?__

4 × 107

4 × 1012

4 × 10−1

4 × 101

Question 7:

Find the quotient.

360,000,000 ÷ 0.0008

4.5 × 1010

4.5 × 1011

4.5 × 1012

4.5 × 109

Question 8:

Size of a Helium atom is 62 pico meter. If 105 Helium atoms are placed in a straight line, how long line will it make? (1 pico meter = 10−12 meter)

6.2 × 10−17 meter

6.2 × 10−7 meter

62 × 10−6 meter

6.2 × 10−6 meter

Question 9:

Weight of a Hydrogen atom is 1.66 × 10−27 kg. How many Hydrogen atoms are there in a container that has 8.3 × 10−3 kg of Hydrogen?